Abstract

SUMMARYA small-spored, white-excipled Dasyscypha frequently found associated with blister rust cankers on Pinus monticola in the northwestern United States has, in the past, been confused with D. Agassizii and D. calyciformis. Specimens of the three fungi were examined and their morphological features, hosts, geographical ranges, and parasitism were compared. In addition, cultural and pathological studies of the Dasyscypha on Pinus monticola were made.As a result, the fungus is considered distinct from D. Agassizii and D. calyciformis. In view of the fact that it was not possible to compare large numbers of collections of the three fungi on various hosts, both morphologically and culturally, the Dasyscypha on Pinus monticola was not proposed as a new species.

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